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Reference
7
REFERENCE
AE Lock Effects for Combinations of AF Point Selection and Metering Method
(when using a mode in the Creative zone)
Program Line
< > The following program line applies when the camera is in Program AE < > mode.
Program Line Description
The lower horizontal axis represents the shutter speed, and the right-hand vertical axis
represents the aperture value. The combinations of shutter speed and aperture value
automatically determined by Program AE are shown as colored lines with respect to the
subject brightness (Exposure Value) gradations on the left and top edges of the graph.
Example: Using an EF50 f/1.4 USM lens with a subject brightness of EV12, the point where
the diagonal line from EV12 (on the top edge) intersects the Program AE line
represents the corresponding shutter speed (1/350 second) and aperture value (f/
3.5) that the program sets automatically.
The diagonal arrowed lines at the upper left indicate the metering range for the
indicated ISO speed.
AF point selection
Metering method
Evaluative metering
Partial metering
Center-weighted average
Auto selection AF
AE lock applied to the
metered value at the active
AF point.
Manual selection AF
AE lock applied to the
metered value at the
selected AF point.
AE lock applied to the metered value at the center AF
point.
–1
–2
–3
–4
1.4
–5
301584212481530601252505001000 20004000
1.0
2
2.8
4
5.6
8
11
16
22
32
6 7 8 910111213141516171819
IS
O 1
00
20
0
400
80
0
10
0
0
EF24–85mm f/3.5–4.5 USM WIDE24mm
EF24–85mm f/3.5–4.5 USM TELE85mm
2120 22
4
3
2
1
0
EV
5
EF50mm f/1.4 USM
Shutter speed
Aperture value (f/no.)